I am getting the MINDS-i 6X6 Kit along with the Arduino Controller pack - they have a Motor Shield which generally will power the Arduino board as well. Shields that power the Arduino like that - are they safe to use with the Netduino?. I was reading that many shields have analog feedback more than the 3.3V which could be an issue, but powering board via Shield is that regulated? I have the Netduino plus and would like to use that in place of the Arduino
Powering the Netduino via another Shield
Started by cdraptor, Mar 28 2012 01:24 AM
4 replies to this topic
#2
Bainesbunch
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Posted 28 March 2012 - 08:14 AM
Hello, and welcome to the forums
I can’t answer the question directly on that shield but I have designed shields myself that put 5v back into the Netduino through the 5v pin.
I have also powered my Netduinos from the 5v output of a USB to serial converter without any issues.
Hope this helps.
Cheers Pete.
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The world will have to wait.
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#3
Stefan W.
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Posted 28 March 2012 - 09:51 AM
You can power the netduino from shield pins, where you have essentially 2 choices: regulated 5V into the 5V pin or unregulated into the Vin pin (7.5 - 12.0 VDC - a little more forgiving than that in reality, this is the tech specs). If your shield does one of that, it's fine.
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#4
Stefan
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Posted 28 March 2012 - 09:54 AM
As Stefan just stated, you'll be fine if you feed 7.5-12V to the Vin pin, or 5V to the 5V pin.
That's indeed an issue when using analog feedback. The analog pins (A0 to A5) measure analog input from 0 to 3.3V. But for feeding power (which is on or off), it doesn't matter.I was reading that many shields have analog feedback more than the 3.3V which could be an issue
"Fact that I'm a moderator doesn't make me an expert in things." Stefan, the eternal newb!
My .NETMF projects: .NETMF Toolbox / Gadgeteer Light / Some PCB designs
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#5
Paul Newton
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Posted 28 March 2012 - 06:45 PM
Hi cdraptor,
I did have an issue when powering the Netduino from/with the same supply as used by a motor shield.
The problem being the motors making the supply so noisey that the Netduino would not function correctly, and would reset when the motors spun up.
My system now uses two separate sets of batteries, and I have not connected the Vin of the motor shield to the Netduino.
This works well.
The analogue feedback issue can be fixed using resistors to divide the voltage down - but, you will need to break the connection between the shield and Netduino to insert the resistors.
Have fun - Paul
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